21200221200 has 120 divisors (see below), whose sum is σ = 69490878688. Its totient is φ = 5521904640.

The previous prime is 21200221199. The next prime is 21200221213. The reversal of 21200221200 is 212200212.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153829 + ... + 257028.

Almost surely, 2^21200221200 is an apocalyptic number.

21200221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200221200 is an abundant number, since it is smaller than the sum of its proper divisors (48290657488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200221200 is a wasteful number, since it uses less digits than its factorization.

21200221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410921 (or 410910 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21200221200 its reverse (212200212), we get a palindrome (21412421412).

The spelling of 21200221200 in words is "twenty-one billion, two hundred million, two hundred twenty-one thousand, two hundred".